Shaped by primary sources in the Library of Congress collections, this site provides an introduction to the study of immigration and focuses on the immigrant groups that arrived in the greatest numbers during the 19th and 20th centuries.

The Library of Congress holds one of the largest library collections in the world. This page provides research aids for using the collection for resources on immigration. Keep in mind the Library of Congress is mainly a book collection, so little is available online. But, as with the National Archives, the Library provides extensive reseach aids.